How to avoid from being getting costed for API gateway in case of DDOS attack

Question

I wanted to have a hard configuration on the number of requests that the API gateway should serve and once we reach that, we should not even get costed for API gateway, how can this be implemented?

Answer

If you want to set a hard limit for requests then set a quota limit https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-api-usage-plans.html#api-gateway-api-usage-plans-overview

> A quota limit sets the target maximum number of requests with a given API key that can be submitted within a specified time interval.

Also take a look at usage plans https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-create-usage-plans-with-console.html#api-gateway-usage-plan-create

Note that API Gateway includes DDOS protection https://aws.amazon.com/api-gateway/faqs/#Security_and_Authorization

> API Gateway automatically protects your backend systems from distributed denial-of-service (DDoS) attacks, whether attacked with counterfeit requests (Layer 7) or SYN floods (Layer 3)

How to avoid from being getting costed for API gateway in case of DDOS attack

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